1 files changed, 10 insertions, 8 deletions

diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index a6c01e121266..82a7c9bfdfa0 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -112,10 +112,6 @@ static unsigned long alloc_iommu(int size)
 static void free_iommu(unsigned long offset, int size)
 { 
         unsigned long flags;
-        if (size == 1) { 
-                clear_bit(offset, iommu_gart_bitmap); 
-                return;
-        }
         spin_lock_irqsave(&iommu_bitmap_lock, flags);
         __clear_bit_string(iommu_gart_bitmap, offset, size);
         spin_unlock_irqrestore(&iommu_bitmap_lock, flags);
@@ -635,14 +631,20 @@ static int __init pci_iommu_init(void)
                 printk(KERN_INFO "PCI-DMA: Disabling IOMMU.\n");
                 if (end_pfn > MAX_DMA32_PFN) {
                         printk(KERN_ERR "WARNING more than 4GB of memory "
-                                        "but IOMMU not compiled in.\n"
-                               KERN_ERR "WARNING 32bit PCI may malfunction.\n"
-                               KERN_ERR "You might want to enable "
-                                        "CONFIG_GART_IOMMU\n");
+                                        "but IOMMU not available.\n"
+                               KERN_ERR "WARNING 32bit PCI may malfunction.\n");
                 }
                 return -1;
         }
 
+        i = 0;
+        for_all_nb(dev)
+                i++;
+        if (i > MAX_NB) {
+                printk(KERN_ERR "PCI-GART: Too many northbridges (%ld). Disabled\n", i);
+                return -1;
+        }
+
         printk(KERN_INFO "PCI-DMA: using GART IOMMU.\n");
         aper_size = info.aper_size * 1024 * 1024;       
         iommu_size = check_iommu_size(info.aper_base, aper_size);